Hi Steve
What are the chances of capturing a trace off the wire at one of the sites that is failing, and another from your server a the same time?
Comparing the two will allow you to determine if anything weird is happening to your packets in transit.
I find the Raspberry Pi a most excellent tool for this purpose. I config them up to call home & hold a tunnel open through the users inevitable NAT. I post one out to the end user, get them to plug it in where the fault is occurring, and then I log into it though the tunnel and do all the testing and captures remotely. Coupled with capturing tcpdumps on the server's interface itself , this gives full visibility of both ends of the connection (and hence the ability to determine if the packets are coming through uninhibited).
I find them such an invaluable tool I always keep one ready to send! Not sure if this is plausible for you, but maybe the thought will spur other ideas.
Pete
On 2/07/2014, at 3:21 PM, Steve Holdoway
Sorry, small fry here looking for guidance. I have a couple of websites running on separate VPSes at Optus in Sydney, and they are showing exactly the same symptoms: they seem to be working fine if routing from NZ via Voda or TC / Vocus, but if using Telecom, they can't POST anything at all - can view webstes no bother, but logging in, filling in forms, forget it.
Any ideas? I set up both sites so may have done something weird ( I'm on voda! ) and not noticed.
Quote from forum user - pretty succinct:
"At work - no problems - we use a Telstra/Voda link to Oz then out to the world through corporate IT there. Works like a dream. Response times are <1ms.
On mobile 3/4G via Vodafone it works okay, no performance or login issues that I can tell.
At home, my old man's place, and the in-laws place, all Telecom (and Wi-Fi onto my iDevices) it is okay to browse without being logged in but as soon as you log in it either 1.) logs you straight out of whatever page your on when you navigate to another page, or 2.) it runs like arse and won't let you post, then logs you out. Basically unusable."
Is this a known problem with a simple fix, or have I stuffed up???
Cheers,
Steve